EXCEL: SUM of only visible cells

EXCEL: SUM of only visible cells

From: http://stackoverflow.com/questions/759656/how-does-one-sum-only-those-rows-in-excel-not-filtered-out

If you are 'filtering' by hiding rows, the function number should be updated to 109.
=SUBTOTAL(109,B1:B20)

The function number 109 is for the SUM function as well, but hidden rows are ignored.